Six moles of a monatomic ideal gas at (4 MPa, 4 L) is expanded isothermally until the volume is doubled (step 1). Then it is cooled isochorically until the pressure is 1 MPa (step 2). The temperature drops in this process. The gas is now compressed isothermally until its volume is back to 4 L, but its pressure is now 2 MPa (step 3). Finally, the gas is heated isochorically to return to the initial state (step 4). (a) Draw the four processes in the pV plane. P( MPa) P( MPa) P( MPa) P( MPa) 4 2 4 2 3 V(L) V(L) V(L) 1 1 2 (b) Find the total work done by the gas (in 3).

Elements Of Electromagnetics
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Six moles of a monatomic ideal gas at (4 MPa, 4 L) is expanded isothermally until the volume is doubled (step 1). Then it is cooled isochorically until the pressure is 1 MPa (step 2). The temperature drops in this process. The gas is now compressed isothermally until its volume is back to 4 L, but its pressure is now 2 MPa (step 3).
Finally, the gas is heated isochorically to return to the initial state (step 4).
(a) Draw the four processes in the pV plane.
P( MPa)
p( MPa)
P ( MPa)
P( MPa)
8
1
3
1
3
4
4
2
2
4
1
1
V (L)
V (L)
V (L)
V (L)
4.
8
1
2
4
8
(b) Find the total work done by the gas (in J).
Transcribed Image Text:Six moles of a monatomic ideal gas at (4 MPa, 4 L) is expanded isothermally until the volume is doubled (step 1). Then it is cooled isochorically until the pressure is 1 MPa (step 2). The temperature drops in this process. The gas is now compressed isothermally until its volume is back to 4 L, but its pressure is now 2 MPa (step 3). Finally, the gas is heated isochorically to return to the initial state (step 4). (a) Draw the four processes in the pV plane. P( MPa) p( MPa) P ( MPa) P( MPa) 8 1 3 1 3 4 4 2 2 4 1 1 V (L) V (L) V (L) V (L) 4. 8 1 2 4 8 (b) Find the total work done by the gas (in J).
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